Sampdoria ended their negative streak with a 4-1 victory, including Fabio Quagliarella brace, but Bologna self-destructed.
The Blucerchiati were without a win since early October and were fortunate to earn a draw against rivals Genoa in the Derby della Lanterna. Edgar Barreto went off injured in that game, while Bologna missed Blerim Dzemaili and Sebastien De Maio, moving to a 3-5-2 formation.
The visitors last won this fixture 3-2 in March 1998, managing only three draws and eight defeats here in Serie A.
It took just 10 minutes to break the deadlock at Marassi, as Gianluca Caprari dribbled past several players down the left and rolled across for Dennis Praet to fire in from six yards.
Emil Audero needed a fine reaction save, getting down for a one-handed save at the near post on Diego Falcinelli. From the resulting corner, Svanberg whipped in a cross for Andrea Poli to tap in at the back stick and equalise.
England Under-21 international Ronaldo Vieira had his first Serie A start, but seemed to be struggling with the pressure of the occasion, giving the ball away repeatedly in midfield.
Erick Pulgar has far more Serie A experience, yet he was at fault when caught napping on the edge of his own penalty area by Gaston Ramirez, who set up Quagliarella for a simple finish.
Ramirez got the opportunity to go from provider to scorer, as a Caprari through ball cut the Bologna defence like butter and he lifted the finish over the on-rushing goalkeeper. Ramirez did not celebrate against his old club.
Quagliarella saw Lukasz Skorupski off his line and tried his luck from the centre-circle, but fired wide.
Bologna struggled to make any impact in the second half, Ladislav Krejci blasting over from a Federico Santander knock-down.
Instead, Quagliarella was in the right place at the right time, redirecting a wayward Karol Linetty angled drive from close range.
The Rossoblu and their Coach Pippo Inzaghi looked thoroughly defeated in the closing stages and completely lacking in confidence.
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